B.)The caste system is the correct answer
Because you could just sit in your trench and wait for the opponent to attack, at which point you could shoot him, throw explosive devices, or even use chemical weapons that weren't banned then.
Answer:
The South had the problem of having an agricultural economy. It's difficult to win a battle when all you grow is cotton, tobacco, and rice. The South, for example, had almost no industrialization, and found it hard to produce weapons or uniforms.
World War II led to a major advancement in domestic education because the GI bill was introduced, which allowed returning veterans to go to college for free. This greatly increased the education labor force and subsequently GDP. In terms of International Relations, the US left WWII the undisputed leader of the world.